1,720,956 research outputs found
Equip d’espectrometria d’impedància de baix cost
No full textEn aquest Treball Final de Grau, es desenvolupa tota la informació necessària per
a produir un prototip d'un equip d'espectrometria d'impedància de baix cost, es
justifiquen els fonaments teòrics de funcionament de l'equip, s'explica el maneig a
nivell d'usuari i es mostren els resultats de l'anàlisi del seu comportament.
S'ha donat un format professional al treball, en forma de projecte d'enginyeria, per
la qual cosa s'inclouen els documents clàssics de tot projecte: memòria descriptiva i
annexos, plànols, plec de condicions i pressupost.
El treball desenvolupat es divideix en diverses parts: disseny del circuit elèctric,
disseny del programari del microcontrolador, disseny del programari per a ordinador
personal, avaluació del funcionament de l'equip i redacció del present projecte.
El funcionament de l'equip d'espectrometria consisteix a representar la resposta
en freqüència (diagrama de Bode) d'una determinada mostra (xarxa elèctrica
passiva) per a un ample de banda de 10Hz a 1MHz.
Durant el seu desenvolupament s'ha pretès dissenyar un equip portàtil i de fàcil
maneig, que permeta un ús fóra del laboratori, de fàcil transport, pes reduït i poc
consum d'energia.Tamarit Peris, FM. (2014). Equip d’espectrometria d’impedància de baix cost. Universitat Politècnica de València. https://riunet.upv.es/handle/10251/54393Archivo delegad
Análisis comparativo de la estabilidad de un sistema de cogeneración basado en aerogenerador flotante y turbinas de corriente marina
No full textIn this work, a comprehensive analysis of the stability of a complex floating system of 6 degrees of freedom, designed for the generation of wind and renewable marine energy, is proposed. In the case of a floating system, stability is the property possessed by that system to recover or maintain the equilibrium position when it is lost due to the forces acting on it.
The main thrust forces acting on the floating system will be those of the wind, those derived from wave dynamics and from the currents of the sea. Although the wind and waves will be in phase in most of the time, because they depend on the first one, this does not happen with the marine currents, which do not necessarily depend on it. Said gap can span a range of ± 180 °, whereby the actuating forces may be to a greater or lesser degree superimposed, across or opposite, affecting in a different way the structural stability of the system. The stability analysis will later allow to propose the advanced control strategies to be considered.En este trabajo se plantea un análisis exhaustivo de la estabilidad de un sistema complejo en flotación de 6 grados de libertad, diseñado para la generación de energía eólica y marina renovable. En el caso de un sistema en flotación, la estabilidad es la propiedad que posee dicho sistema de recobrar o mantener la posición de equilibrio cuando ésta se pierde debido a las fuerzas actuantes sobre él.
Las principales fuerzas de empuje actuantes sobre el sistema flotante, serán la del viento, las derivadas de la dinámica de las olas y la de las corrientes marinas. Aunque el viento y las olas estarán en fase en la mayoría de las veces, por depender estas del primero, no ocurre así con las corrientes marinas, que no dependen necesariamente de éste. Dicho desfase puede abarcar un rango de ±180º, con lo que eventualmente las fuerzas actuantes pueden ser en mayor o menor grado superpuestas, de través o contrapuestas, afectando de distinta manera a la estabilidad estructural del sistema. El análisis de estabilidad posteriormente permitirá plantear las estrategias de control avanzado a considerarTamarit Peris, FM. (2017). Análisis comparativo de la estabilidad de un sistema de cogeneración basado en aerogenerador flotante y turbinas de corriente marina. Universitat Politècnica de València. https://riunet.upv.es/handle/10251/89996TFG
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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